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Adam Jones, Chris Brogden, Richard Page, Ben Langley, and Matt Greig

measure of external loading in soccer. 17 , 18 Typically integrated within the GPS unit is a triaxial accelerometer, a microinertial sensor that provides a higher sampling frequency than the GPS unit. This microtechnology is used to establish a mechanical loading metric termed PlayerLoad, based on the

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Ross Armstrong, Christopher Michael Brogden, and Matt Greig

quantifies acceleration changes in anterior–posterior, medio-lateral, and vertical directions using a vector magnitude termed PlayerLoad measured as an arbitrary unit (a.u.). 15 Although the center of mass which approximates to the cervico-thoracic junction has been advocated as the optimal anatomical

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Adam Jones, Richard Page, Chris Brogden, Ben Langley, and Matt Greig

to ankle sprain injury. The mid-tibia site was selected as providing anatomical relevance to the ankle (given the prevalence of ankle sprain injury in soccer), without constraining movement. Furthermore, the PlayerLoad metric can be calculated in each axial plane, providing greater richness of data

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Phillip M. Bellinger, Cameron Ferguson, Tim Newans, and Clare L. Minahan

high-intensity running completed, quantified by GPS technology, and PlayerLoad, calculated from triaxial accelerometers, can be used to quantify external match and training loads. 1 – 3 An imbalance between training/competition loads and recovery over extended periods of time may contribute to

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Marni J. Simpson, David G. Jenkins, and Vincent G. Kelly

. Using relative PlayerLoad (PL per minute·), 18 Young et al 17 reported that a total netball training session for elite netballers had significantly lower PL per minute than in matches. However, time spent resting (eg, tactical discussion with coaches or a drink break) was included as “training” and

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Matt Greig and Benjamin Child

lumbar segment kinetics during an 8-over bowling spell, 10 consistent with a recent study that quantified loading using a PlayerLoad metric derived from triaxial accelerometry. 11 Greig and Nagy 11 suggested that if workload restriction guidelines are too conservative, then they might actually impair

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Aaron T. Scanlan, Robert Stanton, Charli Sargent, Cody O’Grady, Michele Lastella, and Jordan L. Fox

. Garments were fitted to each player prior to games. The garments held microsensors (OptimEye s5; Catapult Innovations, Melbourne, Australia) on the posterior, upper surface of the torso to measure external workload variables. PlayerLoad and inertial movement analysis (IMA) variables were used to represent

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Adam Douglas, Michael A. Rotondi, Joseph Baker, Veronica K. Jamnik, and Alison K. Macpherson

recordings of the gyroscope and magnetometer, can successfully quantify sport-specific movements. 7 One such method to quantify the workload performed by an athlete is PlayerLoad, which sums the individual triaxial accelerometer vectors to produce an instantaneous measure of work rate, expressed in

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Marni J. Simpson, David G. Jenkins, Aaron T. Scanlan, and Vincent G. Kelly

rates (100 Hz) that use accelerometers, gyroscopes, and magnetometers to quantify external workload. 5 The accelerometer component of IMUs has been used in a number of sports to quantify the movements performed by athletes. In this regard, PlayerLoad (PL) is a variable that uses raw ACCEL data in

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Charlie Bowen, Kristian Weaver, Nicola Relph, and Matt Greig

measures of PlayerLoad based on the rate of change of acceleration. 15 , 22 Given the aims of the current study, the uniaxial measures of PlayerLoad (mediolateral, anteroposterior, and vertical) were also subdivided into directional indices, so as to consider medial and lateral for example. The medial